A computer-assisted design tool for identifying, specifying, ordering, pulling, connecting and labeling one or more types of electrical cable at a job site uses a job plan as a primary organizing concept. The job plan has one or more applications for which the cable is to be provided and one or more device types to which one of several possible cable types is to be connected. Each device type is associated with one or more locations at which the identified device is located at the site. For each location, a cable length and number of pulls are specified, and a markup legend code is stored to show how the cable length should be marked up to indicate the location to which the cable length is to be connected. The design tool automatically generates markup legend images based on the stored markup codes and enables the user to order all cable requirements for the job over the Internet. The tool also generates comprehensive documentation for the job to be installed, including box labels and wire tags.